Musnad Ahmad 22:7

Hajjaj narrated to us, he said: Ibn Jurayj said: Muhammad ibn Umar ibn Ali informed me, from Abbas ibn Ubayd Allah ibn Abbas, from al-Fadl ibn Abbas, he said: "The Prophet, may Allah bless him and grant him peace, visited Abbas in a desert area of ours, and we had a small dog and a small female donkey grazing. The Prophet, may Allah bless him and grant him peace, prayed the Asr prayer, and they were in front of him, and they were neither moved away nor driven off."